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Crack Formation and Distribution of SiC Coating Prepared by CVD on Carbon/carbon Composites

机译：碳/碳复合材料CVD法制备SiC涂层的裂纹形成与分布

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摘要

In order to further study the cracks initiation and distribution mechanism of SiC coating, then optimize the coating structure and composition on surface of C/C composites, CVD method is used to deposit SiC coating on C/C composites and pyrolytic carbon. Through the analysis on the reasons of cracks initiation via SEM, the influence of different kinds of substrates and the toughening of SiC whisker on the cracks initiation and distribution are researched. The results show that the cracks easily form in the area near the defects and sample edge, and the cracks also mainly distribute in the direction which are perpendicular to the first fiber layer. Compared with pyrolytic carbon matrix, cracks on C/C composites matrix are width and numerous, and SiC whisker toughening coating can significantly reduce the number of cracks.
机译：为了进一步研究SiC涂层的裂纹萌生和分布机理，进而优化C / C复合材料表面的涂层结构和成分，采用CVD法在C / C复合材料和热解碳上沉积SiC涂层。通过SEM分析裂纹产生的原因，研究了不同种类的基体和SiC晶须的增韧对裂纹产生和分布的影响。结果表明，裂纹容易在缺陷和样品边缘附近形成，裂纹也主要分布在垂直于第一纤维层的方向上。与热解碳基体相比，C / C复合材料基体上的裂纹宽且数量多，SiC晶须增韧涂层可以显着减少裂纹数量。

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  • 来源
  • 会议地点 Guilin(CN)
  • 作者

    Junliang Zhu; Xiaohong Shi; Hejun Li; Zibo He;

  • 作者单位

    C/C Composites Technology Research Center, Key Laboratory of Superhigh Temperature Structural Composite Materials, Northwestern Polytechnical University, Xi'an 710072, P. R. China;

    C/C Composites Technology Research Center, Key Laboratory of Superhigh Temperature Structural Composite Materials, Northwestern Polytechnical University, Xi'an 710072, P. R. China;

    C/C Composites Technology Research Center, Key Laboratory of Superhigh Temperature Structural Composite Materials, Northwestern Polytechnical University, Xi'an 710072, P. R. China;

    C/C Composites Technology Research Center, Key Laboratory of Superhigh Temperature Structural Composite Materials, Northwestern Polytechnical University, Xi'an 710072, P. R. China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    C/C composites; SiC coating; Cracks;

    机译：C / C复合材料； SiC涂层；裂缝;

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